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Burner Flame
To avoid personal injury or death due to electric shock, do
not remove any internal compartment covers or attempt
any adjustment. Contact a qualified servicer at once if an
abnormal flame should develop.
At least once a year, prior to or during the heating season,
make a visual check of the burner flames.
NOTE: This will involve removing and reinstalling
the heat exchanger door on the unit, which is held
by two screws. If you are uncertain about your
ability to do this, contact a qualified servicer.
If a strong wind is blowing, it may alter the airflow pattern
within the unit enough that an inspection of the burner
flames is not possible.
Functional Parts
Refer to the unit Parts Catalog for a list of functional parts.
Parts are available from your distributor.
TROUBLESHOOTING
Ignition Control Error Codes
The following presents probable causes of questionable
unit operation. Refer to Diagnostic Indicator Chart for
an interpretation of the signal and to this section for an
explanation.
Remove the control box access panel and note the number
of diagnostic LED flashes.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
WARNING
Internal Control Failure
If the integrated ignition control in this unit encounters an
internal fault, it will go into a "hard" lockout and turn off the
diagnostic LED. If diagnostic LED indicates an internal
fault, check power supply to unit for proper voltage, check
all fuses, circuit breakers and wiring. Disconnect electric
power for five seconds. If LED remains off after restoring
power, replace control.
Abnormal Operation - Heating Codes
External Lockout (1 FLASH CODE)
An external lockout occurs if the integrated ignition control
determines that a measurable combustion cannot be
established within three (3) consecutive ignition attempts.
If flame is not established within the seven (7) second trial
for ignition, the gas valve is deenergized, 15 second inter-
purge cycle is completed, and ignition is reattempted. The
control will repeat this routine three times if a measurable
combustion is not established. The control will then shut off
the induced draft blower and go into a lockout state.
If flame is established but lost, the control will energize
the circulator blower at the heat speed and then begin a
new ignition sequence. If flame is established then lost on
subsequent attempts, the control will recycle for four (4)
consecutive ignition attempts (five attempts total) before
locking out.
The diagnostic fault code is 1 flash for a lockout due to
failed ignition attempts or flame dropouts. The integrated
control will automatically reset after one hour, or it can be
reset by removing the thermostat signal or disconnecting
the electrical power supply for over five seconds. If the
diagnostic LED indicates an external lockout, perform the
following checks:
• Check the supply and manifold gas pressures
• Check the gas orifices for debris
• Check gas valve for proper operation
• Check secondary limit
A dirty filter, excessive duct static, insufficient air flow, a
faulty limit, or a failed circulator blower can cause this limit
to open. Check filters, total external duct static, circulator
blower motor, blower motor speed tap (see wiring diagram)
and limit. An interruption in electrical power during a
heating cycle may also cause the auxiliary limit to open.
The automatic reset secondary limit is located on top of the
circulator blower assembly.
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